A Complete Collection of 100000 Whys
Fav十万个为什么
为什么刀钝了，磨磨就能快？
刀钝了，磨磨就能快，主要是因为磨刀过程去除了钝化的边缘、形成了锋利的刃口、恢复了刀的切割能力。
1、磨刀过程去除了钝化的边缘：刀在使用过程中，刀刃会受到磨损，形成圆钝的边缘。磨刀过程就是通过磨刀石或磨刀器去除这些钝化的部分，使刀刃重新变得薄而锋利。
2、形成了锋利的刃口：磨刀时，通过特定的角度和力度，可以将刀刃磨成一条细长的锋利刃口。这个刃口可以集中受力，更容易切入物体。
3、恢复了刀的切割能力：经过磨砺，刀刃恢复了锋利，切割时的阻力减小，切割能力显著提高，从而达到“快”的效果。
总结：刀钝了，磨磨就能快，主要是因为磨刀过程去除了钝化的边缘、形成了锋利的刃口、恢复了刀的切割能力。
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